Repointing- renewing the mortar joints in masonry construction. This is necessary when the joints erode and recede over time due to weathering and other forces of nature.
Lime mortars are flexible, permeable, durable and self healing to a degree. Lime should be used for masonry repointing as this let's the structure breath.
Cement mortars should not be used for repointing over traditional lime mortar as they will damage the stonework by trapping moisture inside.

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